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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5772c6a2e8cc4080c206c378747dd37f543f46eda2245480eb37ee6002d482c3' 
  AND token = 'gGC+Q2Y/vaeM4NDR7ZmD3q5v+fUxXYcYIeQJY1LcPE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}